Since it's only been a couple of months since you had the PR valve replaced, I would call the plumber that installed it. Could be that you got a defective one. If not, the diagnosis could have been wrong to begin with, i.e. the expansion canister.
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Greg
A pessimist is an optimist with experience.
"In my many years I have come to a conclusion that one useless man is a shame, two is a law firm and three or more is a congress." - John Adams
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